MINIMUM POPULATIONS
FOR WARM-SEASON CROPS
Some problems have been reported with plant
densities of warm-season crops due to soil insects, salt-affected soils, etc.
As a general guideline, the following table lists the minimum stand for
selected crops.
|
Crop |
% of
normal stand |
minimum
stand (plants/A) |
|
Soybean
- 30-inch rows |
25 to 50 |
37,500
to 75,000 |
|
Soybean
- solid seeded |
25 to 50 |
50,000
to 100,000 |
|
Sunflower
- oilseed |
50 to 60 |
10,000
to 14,000 |
|
Sunflower
- confection |
50 to 60 |
8,000 to
11,000 |
|
Dry bean
- navy |
50 to 60 |
45,000
to 60,000 |
|
Dry bean
- pinto |
40 to 50 |
28,000
to 35,000 |
|
Corn -
dryland |
60 to 70 |
- |
|
Corn -
irrigated |
70 to 75 |
- |
|
Buckwheat |
30 to 40 |
240,000 –
320,000 |
Refer to NDSU Extension Service circular
A934 ‘Replanting after early-season crop injury’
for details including replant considerations.
LATE APPLICATION OF POST
BROADLEAF HERBICIDES IN WHEAT
The following is a listing of the maximum wheat
stage for application of POST broadleaf weed herbicides for use in wheat at the
jointing stage and beyond. Keep in mind that grain yield loss likely has
occurred in advanced stages of wheat if sufficient weed populations have been
present since crop establishment. An option to a late POST herbicide
application would be use of a pre-harvest treatment.
|
Herbicide |
Maximum wheat
stage for herbicide application |
|
Peak |
until second
node is detectable |
|
Canvas |
prior to flag
leaf emergence |
|
Express |
|
|
Finesse |
|
|
Harmony Extra or
GT |
|
|
Starane |
through flag
leaf emergence |
|
Ally |
prior to boot |
|
Amber |
|
|
Bromoxynil |
|
|
MCPA amine or
ester |
|
|
2,4-D amine or
ester |
|
Refer to herbicide labels and NDSU Extension
Service circular W-253 ‘2000 ND Weed Control Guide’ for details.